Stone-guard for dental grinding-tools.



PATEN'I'ED OCT. 29. 1907.

P. W. CHANDLER.

STONE GUARD FOR DENTAL GRINDING TOOLS.

APPLICATION FILED DEC.-10,1906.

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PATENT OFFICE.

FRANK W. CHANDLER, OF VALLEY CITY, NORTH DAKOTA.

I STONE-GUARD FOR DENTAL GRINDNG-TOOLS.

Specification of Letters Patent.

Patented Oct. 29, 1907.

Application filed December 10| 1906. Serial No. 347.084.

To all whom 'it 'may concern:

Be it known that I, FRANK- W, CHANDLER, a citizen of the United States, residing at Valley City, in the county ofarnes and State oi North' Dakota, have invented certain'iie and useful Improvements in Stone- Guards for Dental4 Grinding-Tools; and I do hereby fleclare the following to be ,a full, clear, and exact description oi'the invention, such as will enable others skilled in the art to which it appertains to make and use the same. I

My invention relates to dental grinders and has for its object to provide a simple and efiicient detachable guard for the grinding wheels thereof.

To the above ends the invention consists of the novel devices and combinations of deviceshereinafter described aud defined in the claims.

This device," in its preferred form, is illustrated in the accompanying dra-wings, wherein like characters indicate like parts throughout the several views.

Referringto the drawings, Figure l is a plan view, showing the' grinder with one oi my improved guards applied thereto.l Fig. 2 lis a transverse section'taken on the line :l:2 x2 of Fig. the parts being shown on a larger scale than in Fig. 1. Fig. 3 is a section taken on the line xix oi Fig. 2; and Fig. 4 is a-view showing one end oi the shield supporting clamp.

Referring to the parts oi the grind er, the numeral l indicates the barrel or handpiece thereof, the numeral 2 thel rotary spindle, and the numeral 3 the small `grind, stone which is preferably secured to the projecting-end of the spindle 2 by a screw 4, the said parts being the usual construction. The spindle 2 which carries the stone 3 may be driven by the usual fiexible power waste of space as possible, and circurnferentially ex-K tends through somewhat more than 180 degrees, but has sufficient-peripheral opening to permit the wheel 3 to be moved edgewise into and out of said shield. The shield 5 is attached to the projecting ends of a pair of spring arms 6, preferably' formed from heavy wire, and provided at their inner ends with means for detachahly securing them to the barrel or haudpiece l. This attacbing means is preferably a. pair of segmental clamping springs ,7 to which the said arms or rods 6 are soldered, brav-ed` or otherwise secured. The two segmental clamping springs 7 areadapted to be sprung around the barrel or'handpiece 1 and to engage frictionally l v therewith under sufiicient tension tohold the shield properly positioned with respect -to the grind stone 3. AThe barrel l is formed with more or less peripheral grooves, such for instance as indicated at S, and one of these clamping springs 7 is preferably engaged therewith or between certain thereof to properly position the arms 6 a-nd'shield 5, as shown in Fig. l. Preferably, the spring clamps 7 are lined with rubber, leather or `other pliable material, indicated at 9 in .Fig 4.

clamping springs and, furthermore, render the said clamp less liable to slip on said barrel.

In practice it lis necessary'for different kinds of work' i to use grind stones of different diameter, and. it is desirable that for each stone, assmall al shield as possible should be employed. Hence, I make the shield 5 detachable from the' arms 6 and provide shields of different size for different stones'. As shown in the drawings, the shieldv is preferably, at diametrically opposocketsfor the outer ends of. the rods 6, which preferably do not extend completely through the said lugs, but terminate inward oi the outer face oi the shield, as shown in'Fig. 3. Said-Fig. 3 showsgby dotted lines, the shield removed from the spring rods 6 and shows the said spring rods sprung slightly further apart. The said'spring rods'areadapted to be inserted 'into the receiving lugs of shields of different size, and'ivhen insorted, their outward spring tension will frictionally hold said shield to th'e said rods with suilicient force t0 prevent accidental slippage under ordinary usage.

The device described has been put into actual use and has been found efficient lor the` purposes had in view. It is'of small cost and may be very quickly an'd easily applied to and removed 'from the grinding tool.

What l claim is:

1. The combination with a dental lgrinding tool comprising u barrel, a rotary spindle, and a grinding stone carof said stone, and :1 'supporting frame detachably secured to said shield and provided with means for detachable enscribed.

2. The combination with a dental grinding tool, comprising a barrel, a rotary spindle and a grinding stone carried by said spindle, of a segmental shield inclosing a pnrt of said stone, a pair of laterally spaced spring rods detachably secured to said shleld,.and means for supporting said rods from the llarrel of said tool, substantially as described.

ried by said spindle, of a segmental shield inclosing a part' These linings 9 prevent defacing of the barrel l and the site points, provided withv lugs 10 having receiving gagement with the barrel of said tool, substantially as de- 3.*The combination with a dentalV tool, comprising a 10() spring rods 6, the outer ends of which are engageablev with 'seats of said lugs 10, and apair of segmental clamp- -ng springs 7 secured to said rods G and detachably en- .-gageab1e with the barrel of said `tool, substantiallyl as deA scribed.

4:. A stone guard4 for la. dental grinding tool, cemprising "l0- a segmental shield, 1 pair of spring rods 'for supportinar said shield, and a pair of segmental spring clamps secured to said rods and detachably engageable with the'barrel of the grindingiooi, substantially as described.4

1n testimony whereof I affix my signature in presence of two Witnesses.

I FRANK W. CHANDLER'.

Witnesses :'v

JAS. W. STULL, R. W. BASSETT. 

